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Unit 1
Module 3
Cluster 1 Two-Digit Numbers
Activity Sheets 56–63
Distribute activity sheet 57 to the students.
Instruction: activity sheet 57
How is this activity sheet the same as the one before it? How is
it different? Yes, the place value chart is included. Yes, there
is a dotted line that separates the tens and the ones. Yes,
there is an arrow above the ones. Yes, there are TouchPoints.
These equations are subtraction. In subtraction, we start with
the whole and one of the parts. We solve to find the
other part.1
The process is the same. Start with the ones. Subtract 9 – 1.
Use TouchPoints or another strategy if you do not know the
difference between 9 and 1. Write the difference in the box at
the bottom of the ones column. Bring down the 1 in the
tens column.
Differentiated Directions
For students who do not see
the relationship of place value
and the numbers in subtraction,
demonstrate using base ten blocks.
1
Repeat the above process for the other three problems in the first
ŠŠ
39
0@
37
tens
row if needed.
Why do we bring down the number in the tens column? Why
don’t we subtract anything? Think about it. Explain it to your
partner. Yes, there are only ones to be subtracted. If there
were a second number in the tens column, we would subtract.
Sometimes people use a 0 in the tens column to help them
remember to keep the numbers in the columns and to remind
them that a one-digit number has 0 tens. The top number
minus 0 equals the top number. That is why we bring it down.
Read the next problem. Start with the ones. Subtract. Write
the difference in the box at the bottom of the ones column.
Bring down the number in the tens column. Read
the equation.
Stand if you understand how to complete the problems on this
activity sheet.
Complete the first row. Please put your pencil down when you
are finished.
Let’s check our work. Read the equations with me:
19 – 1 = 18, 29 – 4 = 25, 39 – 2 = 37, 48 – 5 = 43. Give a
silent cheer if you had the correct solution for each problem.
Complete the rest of the problems on the activity sheet.
Name
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19
!
18
29
$
25
39
@
37
48
%
43
46
#
43
17
^
11
39
&
32
28
!
27
36
$
32
29
^
23
46
$
42
18
!
17
tens
tens
tens
Independent Practice
Use TouchPoints and the place value chart.
Find and write the difference in the box.
ones
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ones
ones
ones
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tens
tens
tens
ones
ones
ones
tens
tens
tens
ones
ones
ones
tens
tens
tens
ones
ones
ones
2-Digit and 1-Digit Subtraction
57
57
77
Name
6
@
61
2whole
23
part
5
1
3 part
9
^
8
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7
%
%
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part
2whole1
part
7
@
8
$
2whole1
3
part
part
2whole1
part
3 part
9
*
!
7
9
^
Differences within 9
7
Name
Which is the same as
A
B
C
D
9+%?
%+8
&+9
%+9
6+^
Which is the same as
10+^?
10+!0
^+6
(+9
^ +10
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Which is the same as
A
B
C
D
Which is the same as
A
A
B
B
C
C
D
D
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&+8?
8+&
*+8
7+&
9+%
*+9?
*+8
9+*
9+(
* +10
Commutative Property
39
Name
!3
2!
!#
@
tens
ones
1@
!!
!0
!5
tens
ones
24
$
@0
!
tens
ones
3@
5
!0
@
tens
ones
Mia likes fish. She has 13 goldfish, 10 angelfish, 14 guppies, and
tetra. What is the total number of fish Mia has in her collection?
12
fish
Jose collects toy cars. He has 11 trucks, 5 race cars, 1 train car,
and 32 other cars. How many cars does Jose have altogether?
toy cars
15 10 4 20 39
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True
False
4 Addends
65
Name
13 boys went camping last
Saturday. 9 boys went camping
last Friday. The boys each ate
two hot dogs. How many hot
dogs were eaten altogether?
Roy had 17 red jellybeans and
4 green jellybeans. Jim gave Roy
6 blue jellybeans. If Jay gave
Roy 24 red jellybeans, how many
red jellybeans would Roy have
altogether? What would be the
total number of jellybeans?
Ryan rode his bike at 3 miles per
hour. He rode for 2 hours. Ryan’s
dad drove his electric bike at 10
miles per hour. He rode for 1
hour. Ryan’s mom drove the car
at 29 miles per hour. She drove
for 1 hour. How many miles did
the family travel altogether?
In October, 11 days were cold
and 9 days were hot. This month,
21 days were cold and 9 days
were hot. How many days were
hot and cold altogether?
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hot dogs
red jellybeans
total jellybeans
Ryan's miles
family's miles
cold days
hot days
total days
Word Problems
96
Name
tens
ones
tens
ones
34
25
tens
ones
34
25
tens
ones
tens
ones
2
34
25
tens
2
ones
34
25
tens
ones
tens
ones
tens
ones
tens
ones
14
20
9
25
tens
ones
tens
ones
214
25
34w25=——
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2-Digit Numbers
107
Name
A
33-16
B
C
D
A
24+18
B
C
D
A
44- 8
B
C
D
A
18+17
B
C
D
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40-24
34-17
21- 4
40-22
24+24
23+23
21+21
22+22
45-16
18+18
38-19
17+17
16+16
18+18
19+19
18+19
A
40-21
B
C
D
A
16+17
B
C
D
A
38- 9
B
C
D
A
40-24
B
C
D
38-19
26- 8
41-17
45-26
19+19
15+15
18+18
18+15
15+15
42-14
16+17
50-21
31-16
38-19
45-17
32-15
Review Mixed Comparisons
141